Watch former U.S. ambassador to NATO Victoria Nuland's candid, full interview on Putin and allegations of Russian interference in the 2016 U.S. election –all part of "The Putin Files", FRONTLINE's media transparency project. Explore Nuland's full interview and interactive transcript here: https://www.pbs.org/wgbh/frontline/in...

Explore the complete "Putin File" experience here: http://www.pbs.org/wgbh/frontline/int...